Lattice invisibility effect based on transverse Kerker scattering in 1D metalattices

Abstract

The present work proposes a novel method to achieve free phase propagation with unitary transmission efficiency, termed as lattice invisibility effects, based on transverse scattering in 1D cylindrical metalattices. Firstly, we extend Kerker conditions parity symmetry of electromagnetic modes, and a conciser scheme to eliminate both forward and backward scattering simultaneously is presented. Compared to sphere-like particles where the first four Mie modes are required, we find that transverse scattering can be realized here if only two resonances with similar parity symmetry have the same amplitude and opposite phase, because of reduced symmetry in cylindrical systems. Further, we generalize this concept to metalattices and propose an explicit principle to realize lattice transparency, as long as all the modes with similar parity profiles interfere destructively. The proof-of-concept demonstrations have been manifested by exciting pure degraded electric dipoles or co-exciting magnetic dipole and electric quadrupoles using SiO2@InSb or Si@InSb cylinders, respectively. Besides, the invisibility performance can be flexibly tuned by changing either the period of metalattices or the magnitude of external magnetic field. The revealed mechanisms will inspire more comprehensive study of directional scattering and free phase propagation, which can also potentially stimulate several advanced applications like optical cloaking, nanophotonic circuits, etc.

Wide-Angle Invisible Dielectric Metasurface Driven by Transverse Kerker Scattering

“…As expected at K1 833 nm, the incident wave propagates along the z direction and transmits through the metasurface almost without perturbation. The metasurface is rendered invisible, so-called lattice invisibility [25]. At K2 867 nm, as expected, the incident wave, expressed as the absolute value of the amplitude ratio, |E x /E 0 |, is reflected back and the metasurface behaves as a perfect mirror.…”

“…It could also be theoretically realized by the interplay of MD and EQ, which has been proposed in Ref. [25] and shown in a proof-ofconcept demonstration using core-shell SiO2@InSb and Si@InSb in a 1D metalattice geometry in the Terahertz range. Our proposed method enables the realization of metasurface invisibility in a facile extremely-thin Silicon (Si) square nanoplate metasurface, which is more practically feasible and offers technically easier integration into devices than core shell-type structures.…”

“…Conceptually similar to Kerker-type scattering of a single nanoresonator, a Mie-type resonant Huygens metasurface exhibits near-unity efficiency functionalities such as perfect reflection and/or perfect transmission under normal [4,[16][17][18][19] and oblique light wave incidence [20,21]. Since first reported three decades ago, the Kerker effect has been the cornerstone for exotic scattering pattern reshaping employing the coherent interplay of multipolar modes, including the only recent proposed transverse scattering in dielectric resonators [22][23][24][25][26]. It is a fascinating phenomenon, arising due to the simultaneous fulfillment of the first and second Kerker conditions.…”

Constructive and Destructive Interference of Kerker-type Scattering in an Ultra-thin Silicon Huygens Metasurface

“…Asymmetric scattering manipulation due to the ED and MD interference has been studied for almost 40 years [10]. Due to the inherent phase symmetry properties of MD and MQ modes in the forward and backward directions, where the MD displays odd phase symmetry and the MQ displays an even phase symmetry [15][19], the realization of dominant TED and MQ interference in this Letter paves the way towards symmetric scattering manipulation by employing only TED and MQ, such as the unusual transverse scattering, which simultaneously displays zero forward and zero backward scattering for the nanoresonator embedded in an isotropic medium [14]. Additionally, our study clearly demonstrated that the substrate effect is nontrivial in reshaping the farfield radiation pattern and must be taken into account for scattering pattern manipulation.…”

“…Additionally, a dielectric metasurface, or an array of dielectric nanoresonators, sustains overlapping resonant multipolar resonances [7][8][9]. The interplay of multipolar resonances in a metasurface or a single nanoresonator provides another degree of freedom for light tailoring, such as the Kerker effect, the anti-Kerker effect [10][11][12], and transverse Kerker scattering [13][14][15]. Kerker-type scattering, or highly suppressed backward scattering, attracts much interest as it enables a concentrated electric field inside the dielectric structure and far-field scattering in the forward direction.…”